Printing machine



1934- w. T. GOLLWITZER 1,941,681

PRINTING MACHINE Original Filed Oct. 26. 1927 Patented Jan. 2, 1934 l UNITED STATES PATENT OFFICE PRINTING MACHINE Walter T. Gollwitzer, Chicago, 111., assignor to Addressograph Company, Wilmington, Del., a corporation of Delaware Original application October 26, 1927, Serial No. 228,229. Divided and this application April 30, 1929. Serial No. 359,197

10 Claims. (Cl. 101415.1)

This application is a division of my applica her or other suitable material and is mounted tion Serial No. 228,729, filed October 26, 1927. on the plate 11 over the openings 14. The form This invention relates to machines for printpreferably comprises a strip 15 of rubber having ing letters and the like and its object is to prothe printing characters 16 embossed thereon.

vide a flexible printing form adapted to be eas- A backing 1'7 of cloth or other suitable material 50 ily mounted on a roll in the machine for printis cemented to the back of the plate 11 and to ing a signature on the letter. the signature form through the openings where- Another object of the invention is to provide by the signature form is securely held in place on a roll having novel and simple means for dethe metal plate. The signature form is readily tachably securing a signature printing form applied to the roll by engaging the extension 65 thereon. opening 13' with the stationary screw 8 and en- Another object of the invention is to provide gaging the opening 12 with the movable screw a flexible printing form having novel and sim- 10. The screws 8 and 10 constitute retaining deple means for securing it in printing position vices for holding the signature form on the roll.

on a roll in a printing machine. To facilitate engagement of the signature form 7 And a further object of the invention is to with the screw 10 pressure should be applied upon provide novel and simple means for securing a the spring '7 by means of the thumb through the flexible printing form on one side of a flexible opening 9 to depress the spring which has the supporting plate for detachable mounting on a effect of moving the screw 10 to the right, Fig. 1,

roll in a printing machine. where it will more easily enter the opening 12, 75

In the accompanying drawing illustrating a after which pressure on the spring is released selected embodiment of the invention, and the head of the screw will retainedly engage Fig. 1 is a sectional view on the line 1--1 of the opening 12 as the spring springs back to- Fig. 2. wards normal position and will hold the signa- Fig. 2 is a sectional view on the line 2-2 of ture form snugly and securely in place against 80 Fig. 1. the roll. To remove the signature form it is only Fig. 3 is a perspective view on the signature necessary to apply pressure by the thumb through device with the backing partly pulled away for the opening .9 against the spring to move the better illustrating the construction. screw to the right, Fig. 1, free from engagement Fig. 4 illustrates another form of the signature with the edges of the opening 12, whereupon that device. end of the signature plate will spring outward Referring to the drawing 5 is a roll adapted to and the signature form is thereby released from be suitably mounted on an operating shaft 6. A the roll. The wall of the roll is preferably flatfiat spring 7 is fastened at one end by a screw 8 tened on its outside face at 18, 18 and those 35 or other suitable fastening device to the roll and flattened portions extend across the roll as chords 90 its other end projects across an opening 9 in the 0f the circle thereof and merge with the peroll and carries a screw 10 or other suitable fasriphery so that the screws 8 and -10 which hold tening device which projects through said openthe ends of the signature form plate 11 are out ing. The spring '7 is curved to fit more or less of contact with the work upon rotation of the snugly against the inner face of the wall of the printing device inasmuch as the screws project 95 roll under normal conditions when the roll is outwardly in an amount less than the thickness not carrying a'signature form, but when a signaof the printing device. In Fig. 4 I have shown ture form is mounted on the roll the spring is another signature form comprising an elongated tensioned sufiiciently to hold the signature form rubber strip 19 having printing characters 20 emin proper position on the roll. bossed thereon and provided with a fabric back-- 100 The signature form shown in Fig. 3 comprises ing 21- ThiS form ha ey s 22 o engage the k an elongated flexible plate 11 preferably made of retaining screws 8 and 10. sheet spring steel provided with tapering open- The invention provides a novel and simple deings 12, 13 which may be of triangular shape in tachable printing form which is adapted to be its end portions. The opening in one end portion easily and quickly mounted on the roll in a 195 has an extension 13 for a purpose hereafter deprinting machine without requiring the removal scribed. The plate is provided with openings 14 of any parts of the machine. This makes it posbetween its end portions and these openings are sible to change the signature form frequently, conveniently made in the form of elongated parif desired, without materially interrupting the opallel slots. The signature form is made of ruberation or limiting the capacity of the machine. 1

Also, new signature forms may be supplied as frequently as may be required to replace worn or damaged forms and secure the best impression results. I have shown the invention adapted for use in the machine of my original application but it may be adapted for and embodied in other machines and I do not restrict it to this particular machine but reserve the right to" adapt it for and embody it in any printing machine in which it may be used and to make changes in the form, construction and arrangement of parts within the scope of the following claims.

I claim:

1. A printing device for printing machines comprising a roll having an opening thereimaspring secured at one end within the-roll and having its other end disposed opposite said opening, and'a printing form detachably engageable with said roll and with the free end of said spring.

2. A-printing device'for printing machines comprising a roll having an opening therein, a spring secured at one end within the'roll-and having its free end disposed opposite said opening, a retaining device carried by the free end of the spring and projecti'ng'through said opening, a fixed retai-ning device on the roll spaced from the retaining device mounted on the spring, and a printing form detachably engageable with said retaining devices.

3; A printing device for printing machines comprising a roll having flattened portions on the periphery thereofand having an opening at one of sai'dflattened portions, said flattened por-- tions extending aschords of the circle' of' the roll and having the ends thereofmerged with the periphery of the roll, a fixed retaining device at one of said flattened'portions, a yieldable retaining device at the other of said flattened portions said flattened portion'sla fixed retaining device at. one of said flattened portions, a yieldable member mounted in said' roll and carrying a retaining device extending through said opening, and a printing form detachably ing devices;

5. In a printing device for printing machines,

a roll, a flexible printing form having centering openings therein, and means including retaining devices and a yieldable circumferentially extend ing arm, said retaining devices projecting from the periphery of the roll and engaging in said openings and cooperating with said "arm to center and detachably secure the printing form on the periphery of said roll;

6. In a printing device for printing'machines,

a roll, a flexible plate having centering openings,

adjacent the ends thereof, a printing form engageable with said retain-' mounted on said plate between the openings, and securing means including retaining devices projecting from the periphery of said roll in an amount less than the thickness of the plate and formand a yieldable circumferentially extending arm, said securing means being adapted to cooperate with said openings to center and detachably secure the plate and form on the periphery of the roll.

7. In a printing device for printing machines, a roll having flattened portions on the periphery thereof extending thereacross as chords of the circle of the roll and having the ends thereof merged with the periphery of the roll, a flexible printing form, and means including retaining devices mounted at the flattened portions and projecting from the periphery in an amount less than the thickness of the printing form and adapted to detachably secure the printing form on the periphery of the roll.

8; A printing device for printing machines comprisinga rollzhaving an opening therein, a radially' extending fixed retaining device on the periphery of the roll, a circumferentially extending'yieldable arm fast in the roll and including a; retaining device projecting radially through the opening, and a printing form detachably engaged withisaid' retaining devices, said retaining devices projecting from the periphery of the roll in anamount less than the thickness of the printing roll and said arm centering said printing form on the'roll and holding it taut thereon.

9; A printing device for printing machines comprising a roll having an opening therein, a radially extending fixed retaining device on the periphery of the roll, a circumferentially extending yieldable arm fast inthe roll and including a re-' in an amount less than the thickness of the printing form and said arm cooperating with said flexible support to center and hold the printing form taut on said roll. 7

101A printing device for printing machines comprising a roll havingan opening therein, fixed retaining devices on the periphery of the roll, a circumferentially extending yieldable arm fast in the roll and including a retaining device projecting through the opening, and a printing form having substantially triangularly shaped openings at its ends adapted for detachable engagement with said retaining devices to' detachably secure the printing form on the periphery of the roll, said retaining devices and said arm coop.- erating with said triangularly shaped openings to center and hold the printing form taut on the roll.

WALTER T. GOLLWITZER. 

